534 SYNOPSIS OP VETERINARY CONTINENTAL JOURNALS. 
worn, and exposes to view a surface of dentine more or less 
extensive, according to the amount of time which has elapsed. 
Let us suppose the wear of enamel to amount to a demi- 
millimetre per month. After six months the table of the 
tooth would be three millimetres in extent. After a year six; 
when, in the latter case, the second pair of teeth commences 
its work and its wear, the first will thus show a table of 
six millimetres in extent; and when this pair, having in turn 
worked for a year, shows an equal amount of dentine exposed, 
the central will show double the amount, twelve millimetres 
instead of six millimetres, they having worked for two years 
instead of one; thus, to the end of the dental evolution, the 
difference between the pairs will remain constant.’ This 
reasoning, though logical, presupposes a regularity in the 
shedding and appearance of the teeth liable to very many 
exceptions. M. Sanson, who has so well shown individual 
variations in his Treatise on Zootechny best knows, and 
all who carefully examine cattle on a farm are also welt 
aware of, the marked results of individuality. When I see— 
to take an illustration from the cowhouse of the Veterinary 
School of Lyons, and this is not very rare—beasts retaining 
their milk teeth until they are twenty-five, and even twenty- 
six months old, and then suddenly and simultaneously losing 
four teeth, central and primary intermediates—when I see 
others, whose central temporary incisors have been shed at 
twenty-one months, and which remain to forty months with 
six milk teeth persistent, and then four teeth, primary and 
secondary intermediates, are shed together—when I see, and 
it is the rule rather than the exception, one tooth, the right, 
for example, shed and replaced two months before its left 
correspondent tooth—I fear that, with Sanson’s system, the 
disputes would not be less numerous than they are now” 
(Cornevin).—From the Bulletin des Seances de la Societe 
Nationale d'Agriculture, lltli December, 1878. The review 
terminates with an extract from the Journal d' Agriculture 
Pratique on the death of Mac Combie, of Tillyfour, “ whose 
name will rest in the agricultural history of England beside 
those of Colling, Bakewel, and Jonas Webb (sic).” 
In a previous synopsis we have drawn attention to certain 
works on the diseases of birds published by continental 
authors. We are pleased to see, by a notice which has been 
sent to us, that Professors Eivolta and Pietro Delprato are 
about to bring out a work on Ornithiatria , or Medicine as 
affecting Domesticated or Semi-domesticated Birds , which 
will he published by Uebelhart, of Pisa, and brought out in 
volumes at an extremely cheap rate. The scientific status 
