ratus finifhed aftd adapted in fo compleat a Man- 
ner, as renders the Ufe of them pleafant and eafy. 
MICROSCOPES fitnple and compound (with 
great Improvements on the latter) which magnify 
to io great a Degree, that the Circulation of the 
Blood in Animals, the Animalcula in Fluids, and 
the Farina of Vegetables, with many other Phe¬ 
nomena, otherwife imperceptible, are clearly dif- 
covered.--Alfo an Improvement of the Ap¬ 
paratus of the folar Microfcope, which by the 
Juftnefs of its Motions, renders it much eafier, as 
well as more advantagious for ufe, than any yet 
extant. 
PRISMS for demonftrating the furprizing The¬ 
ory of Light and Colours; Camera Obfcura’s for 
delienating views in Perfpe&ive, Convex, and 
Concave Speculums of all Sizes; Magick Lan- 
thorns. Opera Glafles, Multiplying and Magni¬ 
fying Glaffes, Barometers, Thermometers •, with 
many other Curiofities not here mentioned. 
REFRACTING TELESCOPES IMPROVED, 
By a method founded on the jufteft Principles and 
Rules of Opticks, and are allowed by the beft 
Judges in Theory (who have made the Compa- 
rifon) to excell any yet made in England , and 
equal in all refpefts to thofe of the celebrated 
Petro Patrone at Milan ; by which Improve¬ 
ment, thofe of two, three, and four Feet, have 
by Experience been found to be much more ufe- 
ful at Sea, than any have hitherto been, and are 
made ONLY by the abovefaid Operators. 
f S 33 
