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V O L. LXXVIII. P A R T II. 
XIV. OBSERVATIONS on the Natural Hiftory of the 
Cuckoo. By Mr,. Edward Jenner. In a Letter to 
John Hunter, Efq. F. R. S, Page 219 
XV. Of the Lemper ament of thofe mufical Injlruments , in which 
the Tones , Keys , or Frets , are fixed as in the Harpfichord , 
Organ , Guitar , dec. By Mr, Tiberius Cavallo, F. R, S. 
P\ 2 3 8 ‘ 
XVI. Defcription of a new Fleffrical Injirument capable of col - 
1 effing together a d'ffufed or little condenfed Quantity of Elec- 
tricity, By Mr, Tiberius Cavallo, F. R. S. p. 255 
XVII. On the Converfion of a Mixture of dephlogifiicated and 
phlogifiicated Air into nitrous Acid , by the eleffric Spark. By 
Henry Cavendilh, Efq. F. R. S. and A. S. p. 261 
XVIII. Experiments on the Fjfeff of various Sub [lances in lower- 
ing the Point of Congelation in Water. By Charles Blagden, 
M. D. Sec, R. S. and F, A. S. p. 277 
XIX. Additional Experiments and Obfervations relating to the 
Principle of Acidity , the Decompofition of Water , and Phlo- 
gifion. By Jofeph Prieftley, LL.D. F, R. S. With Letters 
to him on the Subjeff, by Dr. Withering, and James Keir, 
E fp ... . . ^ P* 31 3 
XX. On the Probabilities of Survivorjhips between Two PerJ'ons 
of any given Ages, and the Method of determining the Values 
of Reverfions depending on thofe Survivorjhips, By Mr, Wii- 
a liarn •* 
