JACK'S LETTERS TO WALLICH, 1819-1821. 233 



out of my letter. I do not recollect exactly what I wrote, but it 

 must have been very short and slight. I wrote some time ago by 

 a vessel that went home direct from Mr. Colebrooke and sent him 

 a copy of the Agricultural Volume and of the two Botanical 

 fascicles. In replying to his present letter I mean to make up a 

 selection of Sumatran rocks, and shall give him some notes on 

 Sumatran Geology, which if he likes he may give to the Society. 



I see there is a paper of his in the Linnean Society, on what 

 I think of demonstrating the Cyrtandraeea?. In my last I think 

 I told of my suspicion of the affinity of Cyrtandra and Didymo- 

 earpus ; since that I have made an expedition to the top of the 

 Sugar loaf, 205 a remarkable mountain in the interior of Bencoolen, 

 in the course of which I found no less than 8 species of Cyrtandra 

 in addition to those I had before, and two species of a new genus, 

 of the same family which I call Loxonia. With these materials 

 I have adventured to construct a new order 296 (Cyrtandraceae from 

 the oldest genus) an account of which I shall send to Lambert and 

 get him to submit to Brown before presenting it, to see if it will 

 stand muster. The order stands thus, Cyrtandra 11 species, Didy- 

 moearpus, 7, and Loxonia 2, exclusive of your Didymi. I shall 

 send you (if I can get it copied) my characters of the order and 

 genera, on which let me have your opinion. Note, Forster's figure 

 of the fruit of Cyrtandra is utterly wrong. 



I have huge suspicions concerning Incarvillea, but I cannot 

 find its carpology any where. I have not yet got the fruit of 

 Eoxb/s Incarvillea parasitica, 207 but as far as I can make out from 

 the dried ovaries the septum appears to be complete and to separate 

 at the sides from the valves, a character which would make it 

 agree with Bignonia?, but not with Didymocarpus. 



In the course. of my excursion to Sugar loaf, I made several 

 interesting discoveries. Two new species of Melastoma which I 

 shall send home 208 to be added to my former paper as M. eximia 299 



295. Jack's journey to the Sugar Loaf Mountain was described in 

 the Malayan Miscellanies, ii. (1822) No. 1, pp. 1-22 and was reprinted in the 

 Society's Papers relating to Indo-China, series 2, vol. ii. pp. 57-69. Baffles 

 in a letter to Marsden under date July 12th, 1821, says "Dr. Jack and a 

 few friends have just ascended the Sugar-loaf and were the first Europeans 

 who reached the summit. ' ' 



296. The paper containing Jack's account of the Cyrtandraceee is 

 to be found in the Transactions of the Linnean Society of London, vol. 

 xiv. (1825). The number of species there described is exactly as given 

 here. 



297. Incarvillea parasitica, Wall, is Aeschynantkus grandiflora, Spreng. 

 But see note No. 276. 



298. The Melastomaceae were also published in the Transactions of 

 the Linnean Society of London, xiv. (1823). 



299. Melastoma eximium, Jack, is Medinilla eximia, Blume. 

 R. A. Soc, No. 73, 1916. 



