[ 41 ? ] 
leaft fullied, or its Pores fill'd with Earth, or other 
terreftial Matter ; on the contrary, not the leaft 
Adhefion of any thing of that kind can be obferv'd : 
Belides, Brimftone made the ordinary way, feems to 
have a different Texture of its internal Parts from this 
Ball. From thefe Obfervations I am ready to con- 
clude it not form'd in the Earth 5 but however fubmit 
it to the Determination of the Curious., and am 
Tour moft obliged Servant , 
Benj. Cooke, 
V. An Account of a Book intitle d, Obferva- 
tiones de Aere & Morbis epidemicis, ab 
Anno 1718, ad finem Anni 1737, Ply- 
muthi facte. His accedit Opufculum de 
Morbo Colico Damnonienfi. Audtore Jo- 
anne Huxham, M. D. R. S. S. Londini, 
apud S. Auften, 1739, 8 Q . Tirawn up 
by Thomas Stack, M. 2 ). F. R. S. 
T HIS Treatife of Epidemicks (in my humble 
Opinion the belt by far of any of this kind 
wrote by the Moderns) is ufher’d in by a large and 
learned Difcourfe by way of Prolegomena ; wherein 
the worthy Author confiders the various Properties 
of the Air, with its Effefts on living Bodies both in 
Health and Sicknefs 5 and then defcribes the Method 
Kkk and 
