384 Scientific Memoranda. 



logical constitution, and the direction of the declivities, but also 

 the variations in the surface of the different mountains are dis- 

 tinctly exhibited to the eye. — R. Ac, Scien. Paris. 



Geology of Africa. — M. Cordier, at a meeting of the Royal 

 Academy of Sciences at Paris, communicated some geological 

 observations, made by Rozet in Africa. M. Rozet is now of 

 opinion, that the earths which he had formerly considered as 

 terrains de transition^ are, in fact, to be classed amongst those 

 belonging to the epoch of the lias and the calcareous gryphites. 

 The most elevated summit of that part of the lower Atlas visited 

 by M. Rozet, and measured with the assistance of the barometer, 

 was 1399 metres (4590 feet) above the level of the Mediter- 

 ranean. 



Chloride of Lime a preservative against Small-Pox and Measles. — 

 M. Remy, a physician at Chatillon, has made some successful 

 experiments on chloride of lime, as a preservative against the 

 small-pox. In a village where the small-pox raged, he caused 

 the only twelve individuals in the place, who yet remained sub- 

 ject to the infection, to be washed thrice a week with a solution 

 of chloride of lime, and gave them at the same time two drops 

 of the solution in a glass of eau sucree. Two of them had a slight 

 eruption, similar to a vaccine which had not taken well ; the 

 other ten, who were not separated from those suffering from the 

 small-pox, had no symptoms of illness. In another village afflicted 

 with the small-pox, of fifteen individuals still subject to it, ten 

 were treated in the same manner, and escaped ; whilst two of 

 the remaining five caught the malady. M. Chevalier stated to 

 the Royal Academy of Sciences at Paris, that he was the first to 

 suggest chloride of lime as a preservative against the small-pox; 

 and observed, that it might be used also as a protection against 

 the measles, by keeping in the chamber of the child whom it 

 was desired to prevent from infection, a saucer of dry chloride of 

 lime, renewed from time to time, and dipping its shirts in a solu- 

 tion of one ounce of concentrated liquid chloride in twelve quarts 

 of water. — Abstract from Jour. Roy. Inst. 



The adult Frog retains the character of the Tadpole. — It appears 

 that some full-grown animals, which have passed through trans- 



