INDEX. 
55^ 
powef of eleftrifying, and of killing its prey at a diftance, p. 9^, 97. Defcriptlon of if, 
p. 96. The effects of its (hock compared with thofe of artificial eleiffricity, p. 96 — loi. 
The gymnotas kills fmall fifhes, and fwallows them, ibid. He kills a cat-fifh, but can- 
not fwallow it, ibid. Thofe fifhes killed by an emilfion ofeleftrical fluid, ibid. A farther 
proof of it, p. 97, 98. Though apparently dead, they recover when removed into other 
water, p. 98. Fifli flunned by a fmall eleftricivl fhock recover in the fame manner, 
ibid. Gymnotus Elcctricus, an account of one, p. 102. Brought from Suri- 
nam, p. 102. 109. Particular dcfcription of it, p. i 6 j. 107. Amphibious, p. 106. 
Its amazing power of giving an tledtrical fhock to any number of perfons, p. 107. 
Power flronger when firfl caugh*, ibid. The fhock received by taking the fifh in both 
hands, p. 108. Alfo bv touching it with one hand, and putting the other in the water 
over its boiiy, ibid. The fame eft'cifl on a number of perfons joining h indf, and at the 
extremities of the circle one touching the fifh, the other putting his hand in the water 
over the body of it, ibid. Differs from the torpedo, ibid. The fhock of the g}’m- 
notus wholly eleftrical, ibid. Communicated by the fame conductors, and intercepted 
by the interpofition of the fame original eleCfrics, p. 109. A frefh-water fifh, ibid. 
9b. Without teeth, ibid. Mr. Bancroft’s account of this animal not very particular, 
p, no. Electrical eels twenty feet long; a fhock from them faid to caufe inftant 
death, ibid.— — An account of one by Mr. Hunter, p. 395. 407. The organs which 
produce the peculiar effeCt of the fifh ueferibed, p. 396, 399. Of the ftruCture of thefe 
organs, p. 399, 402. Of the nerves in this animal, p. 402. 404. Of its blood 
veffels, p. 404, 405. Explanation of plate I. fig. i. and 2. p. 40^. Of plate II, 
fig. I. p. 405, 406. Of pLire III. fig. IV. p. 406, 407. Of plate IV. fig. 5. p. 407. 
H. 
HaffaiAen^ Mr. his account of the effeCts of lightning on a houfe, which was furnlflied 
with a pointed conduCfor, at Tenterden, in Kent, p. 336. Lightning. 
Hale, in Lancafliire, furvey of its inhabitants, in the year 1773. with the ftate of births 
and deaths, 43 1 , n. 
Haygarih, Dr. his obfervations on the bill of mortality for Chefler for the year 1775, p. 83;. 
See Chcjler, 
Healtijinefs, flriking dlfparity of, in the town of Manchefter and in the country round 
ir. P- 323- 
Heat, Experiments on animals andvegetables, with refpeCf to the power of producing, 
p. 446. Animals capable of refifllng external cold while alive, ibid.— —Heat, a 
comparifon of that of London and Edinburgh, p. 4^9. The fummer-heat of London 
exceeds that of Edinburgh more in proportion than the winter heat, p. 460. The 
reafon of this, ibid. Comparative heat and cold of Mufeow and Edinburgh, ibid. 
Connexion between the heat of a country and the heat of its fprings, p. 461. 
Heat, doubts about the common theory of the generatioa of it in the living animal 
body, 122. 
Hcattd 
