and Obfervationso 285 
26. The Lungs of a Frog, blown up and 
dried, will afiid us to difcover the true 
Strudure of that Bowel. 
27. Cochineal, which comes from New 
Spain, and is fo valuable for its Ufe in dying 
Scarlet, Crimfon, and Purple, has been af- 
ferted by fome to be a Seed or Grain, and 
by others, an Infed :; but the Microfcope de¬ 
termines thefe Difputes, by ihewing plainly, 
after deeping it in Water twenty-four Hours, 
an oval Body, Scales, Legs, and a pointed 
Trunk: in fhort, the whole refembles our 
Cow-lady . Many Eggs may be difcovered 
upon opening their Bodies : and if you burn 
them, let their Adies dand two or three 
Days in Water, then filter and evaporate, 
their Salts may be diftindtly feen. 
28. The Feathers of Birds afford Variety 
of Beauty, and differ greatly from one ano-> 
ther, not only in their general Colour and 
Form, but in the Strudure of each particu¬ 
lar Part ; as evdry body mud be ienfible, 
who examines thofe of the Odrich, the Pea¬ 
cock, the Eagle, the Swan, the Parrot, the 
Owl, and all the numerous Species of Birds. 
Their Quills too deferve our Attention : and 
our Obfervations on them will be aflided by 
reading the 36thObfervation in Mr. Hook’s 
Micrography , p. 168; and alfo Mr. Lee ti¬ 
ll 2 wenhoek’s 
