392 Foreign Literature and Science. 



tion of 18 to 26, it much resembles the quartz concretionnc 

 ihermogene of Haiiy ; but the latter is found in concretions 

 in certain hot springs, while the gelatinous quartz is found in 

 sandstone, covered by the coal sandstone, with which it pre- 

 sents a concordant stratification, and superposed in the same 

 manner as the pudding stone, which immediately covers the 

 primitive stratum at Zorterais, department of the Allier; 

 sometimes it serves as a cement to the sandstone, and some- 

 times forms masses in the midst of it, often considerable, the 

 surface of which exposed to the air, passes into quartz nec- 

 tique. The whole must have been deposited at the same 

 time, for the quartz and the sandstone are intimately mixed : 

 there is even a sort of passing from one to the other, and the 

 gelatinous portion always contains round grains of quartz so 

 that it is rare to find the sandstone deprived of this gelatin- 

 ous matter, which serves as a cement when only in a small 

 quantity. No spring in the neighborhood is thermal, saline, 

 or incrusting. — Bull. Univ. March, 1827. 



33. Extract of a letter addressed to M. de Ferussac, Ber- 

 lin, Feb. 27, 1827. — There is here at the present time, a 

 mule from a stag and a mare. The authorities have attested 

 the phenomena, and the structure of the beast is singular 

 enough ; the fore part is a horse and the hinder part a deer, 

 but all the feet are those of the horse. The same stag has 

 covered a second mare, and the result is in anticipation, The 

 king has purchased the mule for the island of Pfaneninsel, 

 where there is a menagerie. — Ibid. 



34. The Duke de la Rochefoucauld. — Detached pieces is- 

 sued from the pen of the Duke, with an abundant and fruitful 

 facility ; all tended to the same end, but by different ways. 

 He rarely put his name to them : it was sufficient for him to 

 have paid a tribute to public good. Among those writings 

 there is one which I may be permitted to cite in concluding 

 this notice, both because it is intimately connected with the 

 objects of this society, and because, as it was published but 

 a few months before he was taken from this world, it remains 

 as his last work, and includes his last thoughts ; — we may 

 justly regard it as a legacy, which in his last moments, he was 

 desirous of leaving to the national industry. It is the " Sta- 

 tistics of the Canton of Creil," modestly printed at Senlis. 

 One hundred copies only were printed without the name of 



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