408 Mr. Gray's further Remarks on the Germs Chameleon. 



to a circle divided into 40 parts, each of which represents one 

 revolution of the wheel {f) and its hand : consequently the 

 upper hand indicates an inch in depth for every division, and 

 goes on to 40, which is more than the usual fall of rain in one 

 vear; while the lower hand points out the tenth parts of each 

 inch, or by subdividing to the thirtieth part of each inch. 



A glass is inserted in the case, to render the graduated 

 circles and hands visible, and the whole may be placed on a 

 suitable stand where it is properly exposed. I would recom- 

 mend, however, that the lower part should be in a greenhouse 

 or other low building, the upper funnel being then connected by 

 a pipe. — A bottle may be placed under the pipe at the bottom 

 of the gauge, so as to receive all the water which passes through 

 it. If this bottle be graduated by a measure of 7*2 cubic 

 inches, each division will indicate y\jth of an inch in depth ; and 

 thus the accuracy of the instrument may be checked, and any 

 irregularity detected until the action is proved to be correct. 



In the construction the use of oxidizable metals should be 

 avoided, for the three pins on the edge of the water-wheel, for 

 the axle of the water-wheel, and for the centre which supports 

 the counterpoise, — all which should be of silver or platina. As 

 the whole is nmch exposed to rust, I should recommend that 

 iron or steel should not be employed in any part. It will be 

 obvious that the instrument possesses the advantage of ex- 

 posing very litde water to the effects of evaporation. 



I am, &c. 



Coed Du, Flintshire, Oct. 1, 1827. John TaylOR. 



LXVII. Some further Remarks on the Genus Chameleon, with 

 the Description of an undescribed Species. By John Edward 

 Gray, Esq. F.G.S. Sfc. 



To the Editors of the Philosophical Magazine and Annals. 

 Gentlemen, 

 TN the last Number but one of your Journal, I described the 

 *- species of the genus Chameleo, which had come under my 

 observation. Since that period, Mr. Bell has presented to the 

 British Museum a specimen o^ Chameleo Tigris oi Kw\\\,-w\i\ch. 

 proves to be a very distinct species most nearly alliedto Chameleo 

 pumillus, but easily distinguished by the central occipital ridge. 



In examining the valuable museum of Mr. Joshua Brookes, 

 I have observed an undescribed species of the genus, which 

 with his usual kindness and liberality he has permitted me to 

 describe, and to have a drawing made of it. — I hasten to lay 

 the description before your readers, as it presents a peculiar 

 form which has not yet been found in the genus. 



The chief peculiarities consist in the eyebrows being pro- 

 vided 



