'334 Proceedings of Royal Society of Edinburgh. [sess. 
identification of the specimen from which the figure is reputed to 
have been drawn is rendered, in many cases, quite impossible. It 
would be much better, in all cases, if each crystal were drawn as 
nearly as possible as it appears ; and that the whereabouts of the 
particular crystal so drawn should be indicated in such a manner 
that the evidence for the forms shown could be easily examined 
by anyone who wished to do so. This would also act as a check in 
future upon anyone who should trace a modified copy of a foreign 
crystal in order to have it re-engraved as one of British origin. 
As examples of actual crystals, malformed by unequal growth 
in different directions, the following figures from crystals of 
Analcime in the Scottish Mineral Collection are given here. Their 
registration marks are given next the figures, as in the other cases. 
Figs. 8 and 9 show forms which are rare in Analcime. 
Fig. 7. 
