C 4°* 3 
of the Parts, -and to order in what Direction and how 
much is neceffary to be done. 
Ilf. The Continuation of An Account of a Trea- 
tife of Fluxions, &c. Book II. by Colin M c 
Laurin, Trof Mathem . Edinburgh. F. R. S. * 
xT 4 l M 3 ! rch T N the firft Book > thc Author defcribed 
1 the Method of Fluxions, and its Ap- 
plication to Problems of different Kinds, without 
making ufe of any particular Signs or Chara&ers, by 
geometrical Demonftrations, that its Evidence might 
appear in the moft iimple and plain Form. In the 
fecond Book, he treats of the Method of Computa- 
tion, or the Algebraic Part ; to the Facility, Concife- 
nefs, and great Extent of which, the Improvements 
that have been made by this Method are in great 
meafure to be afcribed. In order to obtain thofe 
Advantages, it was neceffary to admit various Sym- 
bols into the Algebra : But the Number and Compli- 
cation of thofe Signs mud occafion fome Obfcurity 
in this Art, uniefs Care be taken to define their 
Ufe and Import clearly, with the Nature of the 
feveral Operations. An Example of this is given by 
an Iiluftration of one of the firft Rules in Algebra. 
As it is the Nature of Quantity to be capable of Aug- 
mentation and Diminution, fo Addition and Sub- 
ftradlion are the primary Operations in thc Sciences 
that treat of it. The pofitive Sign implies an Incre- 
* See the Beginning of this Account, N°468. p. 325. 
menr. 
