Mr. T. Andrews's Chemical Researches on Cholera Blood. 295 



The before-mentioned mines are selected merely because 

 they afforded examples of the various results in the different 

 strata of our mining districts. They appear to show, 



For Mines of which the Depths are constant : 



1. That although the rain falling appears to exert, after a 

 certain time, some influence on the quantity of water drawn 

 out of mines, yet the amount of this effect is not in a direct 

 simple proportion. 



2. That although great differences in the quantity of rain 

 appear to modify the quantity of water in mines, yet the va- 

 riations so induced, sometimes disappear when the differences 

 of rain falling are small. 



3. The times elapsing between the maxima and minima of 

 rain, and those between the maxima and minima of water in 

 the mines, are often not identical ; nor are they always the 

 same for different mines. 



For Mines increasing in Depth : 



4. From Tables IV. IV^ V. VI. and VII. it would appear, 

 that in mines from 70 to 120 fathoms deep, the quantity of 

 water is increased as the depth is augmented; but that in 

 others of from 130 to 180 fathoms in depth, an augmented 

 depth induces a diminution in the quantity of water. 



It is not my intention to insist on the universality of these 

 inferences, which further investigations may, perhaps, show 

 to be of but limited application. I regret that more pressing 

 engagements at present forbid my enterhig further on the sub- 

 ject, to which however I hope on another occasion to return, 

 with other matter, which is now in a state of preparation. 

 I have the honour to be. 



Your most grateful humble Servant, 

 Perran Wharf near W. J. Henwogd. 



Truro, Junes, 1832. 



LIV. Chemical Researches on the Blood of Cholera Patients. 

 By Thomas Andrews, Esq*. 



'' ■"'HE discordancies in the various analyses which have been 

 -^ published of the cholera blood, rendering it desirable 

 that the subject should be again investigated with precision, I 

 availed myself of the opportunity afforded by the prevalence of 

 the epidemic in Belfast, to institute a new set of experiments. 

 The first analysis of cholera blood that appeared in this 



sign to the numbers in this column ; when the excess is on the otiicr bide, 

 the — ' sign. 



• Communicated by tlic Author. 



