The CONTENTS. 
Page 
To chufe, prepare, preferve, and apply objects to 
the microfcope xliii 
A method of meafuring in compound microfcopes xlvi 
A micrometer xlix 
The ufe of the micrometer and fedforal fcale li 
Of the circulation of the blood, and how to examine 
it by the microfcope I 
The defcrlption of a new apparatus for confining 
frogs, mice, bats, dec. 18 
Of bones 23 
Of the mufcular, or flefiiy fibres of animals 27 
Of hairs 32 
Of the fcales in the human Ikin 34 
Of feathers 35 
Of flies 39 
Of the feet of flies 40 
Of the eyes and head of a grey drone, fly 42 
Of the wings of flies 45 
Of a blue fly 49 
Of flies which infefl: fruit and other trees 52 
Of excrefcencies growing on willow-leaves, and a 
fmall fly bred thereon 55 
Of the crane fly, or father long-legs, &c. 59 
Of oak cones ■ 6 2 
Of an infedt found upon the leaves of fpiees, and 
wood of feveral kinds, and of other flies 65 
Of the cochineal fly 70 
Of the death watch 72 
Of a gnat 74 
Of the tufted brufh -homed or male gnat 76 
Of the great bellied or female gnat 77 
Of 
