S 22 INDEX. 
Salts *——- - of Alum 
1 
from Salt Springs J 
Sal Gem 
L - 
P* 
263 
from Sea-Water | 
Nitre 
1 
Caicarious Nitre 
264 
Sand (Grain of) how underilood as a Meafure 
41 
Sands tine Objects for the Microfcope 
— — 
288 
Scale of Beings confidered — 
307 
Scales on the human Skin 
— 
— 
172 
how numerous 
— 
*73 
Way to view them 
_ 
ibid . 
of Fifhes —• 
237 
fhew their Age 
— 
— 
238 
how to prepare 
— 
— 
ibid. 
Scolopendra ; vide Multipes. 
Scorpion ; vide Sting. 
Seeds not proportioned to the Size of their Plants 
—. 
165 
include minute Plants —- 
: . • 
- — 
252 
of the Gramen tremulum 
■- 
— 
ibtd. 
to prepare — —> 
-- 
—• 
253 
of Strawberries ) . 
Poppy 5 
— 
ibid. 
Fern — —• 
—■ 
—- 
254 
Puff-Ball — — 
... —■ * r . • <■ 
— 
255 
*- how hurtful to the Eyes —- — 256 
Semen Mafculinum : vide Animalcules* 
Serpents (minute) — 
Shaije, &c. drawn by a Flea —- —■» 
Sheep (Worms in; : vide lnfeSls. 
Sight , us Difference how occafioned • —— \ 
common Standard of —* — 
Silk-Worm —— —- 
Semen thereof examined —- - — 
Length and Finenels of its Silk —- ■ —— 
Sliders what — — - - - ' - -> 
their great Ufe *— —* - —- 
to prepare a Set of properly — 
Snail, a curious Animal — •— 
Manner of Produdtion ana Growth —> — 
Stone found therein • — —- — 
Snow, its Configuration curious — —- 
Solar or Camera Obfcura Microfcope : vide Mierofcope . 
Spider, its Eyes —« —■ 
78 
m 
4» S 
33 
281. 
28 z. 
2 94 
10 
56 
57 
217 
218 
ibid* 
29O 
196 
Spider s 
