[ 445 ] 
Defcription of a new electrical inftrument, p. 245. 
Cavendj b, Henry, Efq. account of experiments made at Albany Fort, p 166. On the 
converfionof a mixture of dephlogiftieated and phlogilbicated airs into nitrous acid, by 
the electric fpark, p. 261. 
Celts, Michael Rubin de, on native iron found in South America, p. 37, 183. 
Centers , on moveable, p. 95. 
Corollary. If the freezing point of the folution of a fait in water in any known proportion 
be given, its degree of folubility may in general be ascertained, merely by trying the 
greatell cold it will produce with fnow, p. 296. 
Corollaries , mathematical, p. 63 , 7c, 71, 75, 76, 81, 82, 83, 87, 90, 91, 92. 
Croonian Leflure on mulcular motion, p. 23. 
Cuckoo , obfervations on the natural hiftory of, p.219. The cuckoo makes choice of the 
nefls of a great variety of fmall birds, p. 221. A cuckoo choofes the net ot a hedge- 
fparrow to lay her egg in, p. 223. Two cuckoos and a hedge* fparrow hatched in the 
fame neft, p. 229. Why, like other birds, the cuckoo does not buiid a net, incu- 
bate its eggs, and rear its own young, confidcred, p. 229. Subfiances found in the 
ftomach of a cuckoo, p. 235. 
D. 
Darwin, Erafmus, M. D. frigorific experiments. See Air. 
T)ionaa mufcipula, an irritable vegetable, p. 1 6 r - Observation on, p. 163. 
Difcoveries , two, made by the moderns, in the flructure and phyfiology of the body, 
viz. the circulation of the blood ; and the lymphatics, and abforptic n of the lymph, 
P- 33 * 
Dover Cajlle , temperature of the water in the New Well there, p. hi. 
Droftra , obfervation on, p. 163. 
E. 
Eleflrometer, firfb conftructed by Mr. John Canton, p. 3. Conical corks in electrometers 
preferable to pith ball , p. 5. Mr. Dennet’s electrometer, p.406. 
UlcHricity, natural or artificial, methods of manifefling the preleace, and afcertaining 
the quality, of 'mall quantities of, p. x. Mr. Volta’s condenfer ot electricity defcri- 
bed, p 7. Mr. Benner'* doubler of electricity defcioed, p. 8. Nor an iaflrument to 
be depended upon, p. 10, 14. Remarks on the fu jed of electricity in genera!, p. 17b 
Experiment fhewing the great length of time that a quantity of electrici y will remain 
upon a body, p. 19. The air, or in general any fubibance, ig a more or Iefs perfect 
conductor of electricity, acccording as the electricity which is to pafs through it is 
more or lefs condenfcd, p. 20. Brief proposal of an explanation of the production 
N n n z of 
