640 M. Buzareingues on\Domestic Fowls. 



tween these periods and full moon, are 2, 4, 7, and 10 days. 

 Might not these relations, if they are constant, be the effects of 

 the influence of light or darkness on the state of agitation or rest 

 of the hen ? By too much heat, the hen's sitting constantly kills 

 the young, or thwarts their developement. 



I intend to continue my experiments on this subject, and the 

 facts which I obtain, whatever they may happen to be, will be 

 made known to the Academy. 



Annales des Sciences Naturelles. 



1. Description of an Improved. Blowpipe ; % On the Ascent of 

 Mercury on Wires of Iron ; 9t. Experiments on the \ Electro- 

 magnetic Properties of Carbon when in a State of Combus- 

 tion. By Mr K. T. Kemp. Communicated by the Author. 



1. Description of an Improved Blowpipe. 



JPermit me, through the medium of your excellent Journal, to 

 bring under the notice of the public an improvement on the 

 blowpipe. 



The importance of the blowpipe as an instrument of chemical 

 analysis, and of extensive application in the arts, is so well 

 known, that I do not here require to make a single remark on 

 the subject. It has undergone many modifications, from that 

 of the simple bent tube, to the more eflficient instrument when 

 in the form of a hydraulic machine. 



All of them, however, either occupy too much space, are not 

 portable, and are too complicated, or, if not, as in the case of 

 the bent tube, they are hurtful to the lungs, and cannot be used 

 but with much inconvenience, from the necessity of keeping up 

 a continued blast. 



The one I am now about to describe is very portable, re- 

 quires almost no exertion of the lungs, one expiration into it be- 

 ing sufficient to produce a continued blast for about two mi- 

 nutes ; and it also occupies very little space. It consists of a 

 glass-vessel, of a globular shape A B, Plate V. Fig. 8. into the 

 neck of which a cork is fitted, and made perfectly tight by a seal- 

 ing of wax ; through the cork pass two tubes C c and D d, about 



