2- What is Matter and What is Force? Blavatsky's writings on science, or rather philosophy of science are quite well-informed and perceptive and since philosophy of science is currently in a rut, remain of interest. This address the question whether electricity is matter or force, and gives a kind of hylozoic view. [The Theosophist, Vol. III, No. 12, September, 1882, pp. 319-324] Blavatsky, Collected Writings, Volume 4, p. 208 http://www.katinkahesselink.net/blavatsky/articles/v4/y1882_100.htm
3- The Bugbears of Science A kind of alternative science piece that discusses Hypnotism, Mesmerism, and Homeopathy and the differences between materialism and skepticism. [The Theosophist, Vol. IV, No. 5, February, 1883, pp. 105-108] Blavatsky, Collected Writings, Vol. 4, p. 307 http://www.katinkahesselink.net/blavatsky/articles/v4/y1883_015.htm
4- The Dual aspect of wisdom The next three form an inter-related trio of fundamental aspects of spiritual psychology in relation to the scientific notions of her time. [Lucifer, Vol. VII, No. 37, September, 1890, pp. 1-9] Blavatsky, Collected Writings, Volume 12, p. 309 http://www.katinkahesselink.net/blavatsky/articles/v12/y1890_035.htm
5- Kosmic Mind [Lucifer, Vol. VI, No. 32, April, 1890, pp. 89-100] Blavatsky, Collected Writings,Vol. 12, p. 133 http://www.katinkahesselink.net/blavatsky/articles/v12/y1890_012.htm
6- Psychic and Noëtic Action [Lucifer, Vol. VII, No. 38, October, 1890, pp. 89-98] Blavatsky, Collected Writings, Vol.12, p. 350 http://www.katinkahesselink.net/blavatsky/articles/v12/y1890_040.htm
7- Have Animals Souls? One of her more popular articles, an eloquent plea for animal rights with stunning and original erudition. [The Theosophist, Vol. VII, No. 76, January, 1886, pp. 243-249] Blavatsky, Collected Writings, Vol. 7, p. 12 http://www.katinkahesselink.net/blavatsky/articles/v7/y1886_001.htm
8- The Esoteric Character of the Gospels Began as an ambitious series of articles that was not completed. Like Jacob Boehme, she criticizes mainstream Christianity in favor of mystical Christianity, and thus favors a symbolic understand of scriptures and emphasizes how the life of Christ exemplifies an inner process of self-transformation related to symbols of spiritual initiation, and she emphasizes the universal aspect of these symbols, following mainly Gerald Massey. This texts deals largely with an erudite exegesis of the word, Christ, ''Christos''. Certain aspects have influenced modern New Age Christianity. [Lucifer, Vol. I, No. 3, November, 1887, pp. 173-180] H.P. Blavatsky, Collected Writings, Vol. 8, p. 172 http://www.katinkahesselink.net/blavatsky/articles/v8/y1887_030.htm
9- Commentary on the Pistis-Sophia A lengthy, fragmentary commentary on Gnostic mysticism that remarkably original and insightful. [Lucifer April, 1890, to April, 1891] H.P. Blavatsky, Collected Writings, Vol. 13, p. 1 http://www.katinkahesselink.net/blavatsky/articles/v13/ps_13.htm
10- The Beacon of the Unknown One of the major pieces that examine the evolution of the Theosophical movement and defends Theosophy from a position of esoteric traditionalism. [La Revue Théosophique, Paris, Vol. I, Nos. 3, 4, 5, 6; May 21, 1889 Blavatsky, Collected Writings, Volume 11, p. 248 http://www.katinkahesselink.net/blavatsky/articles/v11/y1889_033.htm
11- Philosophers and Philosophocules Another piece on the Theosophical movement that focuses on rational and philosophical technicalities. [Lucifer, Vol. V, No. 26, October, 1889, pp. 85-91] Blavatsky Collected Writings, Volume 11, p. 431 http://www.katinkahesselink.net/blavatsky/articles/v11/y1889_060.htm
12- A Land of Mystery A lengthy piece on esoteric knowledge in South America. [The Theosophist, Vol. I, No. 6, March, 1880, pp. 159-161] Blavatsky, Collected Writings, Vol. 2 , p. 303 http://www.katinkahesselink.net/blavatsky/articles/v2/y1880_018.htm
13- Lamas and Druses An original study on the Druses and their apocalyptic views, with comparisons to Tibetan Buddhism. [The Theosophist, Vol. II, No. 9, June, 1881, pp. 193-196] H.P. Blavatsky, Collected Writings Vol. 3, p. 175 http://www.katinkahesselink.net/blavatsky/articles/v3/y1881_053.htm
14- Zoroastrianism in the light of occult philosophy One of several substantial pieces on the mystical aspects of the Zoroastrian religion. [The Theosophist, Vol. IV, No. 9, June, 1883, pp. 224-26] Blavatsky, Collected Writings, Vol. 4, p. 513 http://www.katinkahesselink.net/blavatsky/articles/v4/y1883_075.htm
15- Alchemy in the XIXth Century An introduction to alchemy compared with eastern concepts including Chinese alchemy. [La Revue Théosophique, Paris, Vol. II, Nos. 8, 9, 10, October, November and December, 1889] Blavatsky Collected Writings, Vol. 11, p. 528 http://www.katinkahesselink.net/blavatsky/articles/v11/y1889_070.htm
16- The Kabalah and the Kabalists at the close of the XIXth Century One of several erudite critical pieces on the origins of the Kaballah. [Lucifer, Vol. X, No. 57, May, 1892, pp. 185-196Blavatsky, Collected Writings, Vo. 7, p. 250 http://www.katinkahesselink.net/blavatsky/articles/v7/yxxxx_025.htm
17- The 6 and 5-pointed Stars An insightful piece on esoteric symbolism. [The Theosophist, Vol. III, No. 2, November, 1881, pp. 31-33] H.P. Blavatsky, Collected Writings, Vol. 3, p. 312 http://www.katinkahesselink.net/blavatsky/articles/v3/y1881_089.htm
18- Theosophy and Spiritism One of the more basic critical articles on the spiritualist movement in response to a Spiritualist writer. [Bulletin Mensuel de la Société Scientifique d’Études Psychologiques, Paris, July 15, 1883, pp. 129-151.] Blavatsky, Collected Writings, Vol, 4, p. 36 http://www.katinkahesselink.net/blavatsky/articles/v5/y1883_099.htm
19- The Babel of Modern Thought A basic presentation of a cyclical view of history and the relation between modern scientific discoveries and ancient science, with a introduction to the Secret Doctrine. [Lucifer, Vol. VII, No. 41, January 1891, pp. 353-360] H.P. Blavatsky, Collected Writings, Vol. 13, p. 83 http://www.katinkahesselink.net/blavatsky/articles/v13/y1891_001.htm
20- Devachan: Western stricture and eastern version An article that elaborates on the the life-after death topic in response to three questions. [The Theosophist, Vol. IV, No. 11(47), August, 1883, pp. 266-272] Blavatsky, Collected Writings, Vol. 4, pp. 70-94 http://www.katinkahesselink.net/blavatsky/articles/v5/y1883_102.htm
21- Elementals An explanation of nature spirits that elaborates on material from Isis Unveiled. [Lucifer, Vol. XII, No. 72, August, September and October, 1893] Blavatsky Collected Writings, Vol. 6, p. 184 http://www.katinkahesselink.net/blavatsky/articles/v6/yxxxx_007.htm