C 199 ] 
magnifies fiill more, there appears a fort of Net- work 
of Fibres, which divide, and reunite, to form this Net. 
Under the firll Order of this Net-work, which ap- 
pears white, another is feen fomewhat red, and under 
this a Third and a Fourth, ftill deeper coloured : In 
fine, the Ground under all thefe reticular Strata, is 
of a very deep Red j and the Whole may be juftly 
enough compared to a Piece of Wood dripped of its 
Bark. It is probable, that this fort of Injedion, made 
by the way of Digeftion, might lead an able Ana- 
tomift to ibme very ufeful Difeoveries on the Na- 
ture and Formation of the Bones. Nay, I think I 
have already found out fomething new on this Head ; 
but, as I have ftill fome Scruple remaining on my 
Obfervations, I will not venture to communicate the 
Confequences drawn from them. 
In order that the Madder fhould produce the above 
related Effed on the Bones, its Tindure muft have 
fuch a Degree of Fixity, (according to the Dyers 
Term) as not to be changed by the diflblving Adion 
of the Saliva,, of the Juice of the Stomach, of the 
pancreatic Juice, of the Bile, <d;‘c. nor by the peri- 
ftaltic Motion of the Stomach and Inteftines ; and yet 
thefe Juices ad fo powerfully on common Aliments, 
that after Digeftion they are not to be known either 
by their Smell, Tafte or Colour. This is not all : 
Thefe colouring Particles muft be fmall enough to 
pafs with the Chyle into the Blood, and circulate 
with it through a great Number of Strainers or VelTels, 
without being feparated, and without being depofited 
cither in the Liver, Spleen, or Pancreas. 
I ftrongly fufped that Portion of the Lymph of the 
Blood, which is fit for laourilhing the Bones, might 
be 
