Scientific Intelligence, Sec. 147 



entomology in all its branches. Mr. Hope terms it Dolkhoscelis 



Haworthii. i 



— — — '— '■ — — "X;..! "Ll ' jL'oO 



ZOOLOGY. 



I. — Description of a New Species of the genus Chameleon. By 

 Mr. Samuel Stutchburg, A. L. S., &c. 

 Chameleon cristatus. C. Superciliari occipitalique carina elevata 

 et crenulata, caudae anteriori parte dorsique apophysibus elongatis 

 cristam dorsalem constituentibus : squamis fere rotundis subsequalibus. 

 The striking peculiarity of this animal consists in its having a dorsal 

 crest, supported by the spinous processes of the Vertebrae, by which 

 character it approaches the Basilisks. It was brought from the 

 banks of the river Gaboon in Western Equinoctial Africa, and was 

 presented to the Museum of the Bristol Institution, by Messrs. King 

 and Sons of that city. 



II. — The Practical Mechanic*s Pochet Guide, <^'c. By Robert 

 WaUace, A. M., Glasgow, 1836. p. 120. 

 This is a very neat and useful little compendium of the most im- 

 portant rules for the practical mechanic, arranged under the heads 

 of I. Prime movers of machinery : 1st. Animal Power. — 2d. Wind 

 power. — 3rd. Water power. — 4th. Steam power. II. Weight, 

 strength, and strain of materials. III. Practical tables : 1st. Weight 

 of metals. — 2nd. Specific gravity and weight of materials. — 3rd. 

 Steam and steam engines. — 4th. Specific cohesion and strength of 

 materials. — 5th. Mechanical powers. The section upon steam is 

 illustrated by a good plate of the steam engine, and a plan is appended 

 to the work of the land which has been drained behind the town of 

 Greenock, and of the great reservoir which is supplied by these 

 numerous drains. We have no doubt that Mr. Wallace's book will 

 be duly appreciated by those for whom it is intended, and we recom- 

 mend it to the attention not of mechanics alone, but of all who are 

 interested in this important branch of philosophy. 



Article X. 



SCIENTIFIC INTELLIGENCE. 



I. — Phai^macy, ^'c. 



1. Quinin and Clnchonin. — Geiger has described a simple method 

 of separating these principles from the alkaline mass which does not 

 crystallize with acids, and which Serturner termed Quinoidin, The 

 compound dissolved in water, saturated with an acid, should be mixed 

 with an excess of neutral acetate of lead, by which means the resin- 

 ous matter in combination with the basis will be precipitated in union 

 with the oxide of lead. The solution should then be filtered and 

 digested with freshly heated animal charcoal, until a filtered speci- 

 men ceases to re-act on oxide of lead. The lead may then be pre- 

 cipitated by phosphate of lime, or sulphuretted hydrogen. Potash or 

 soda will now precipitate the Quinin and Cinchonln, and the mother 



L 2 



