— 40 — 
will be of servicfe to those who have only small collections, or wish to keep a 
representative series of specimens apart from a general collection. The method 
is the result of some years of experimenting, and has the advantage of working to 
perfection. 
The specimen-envelopes are mounted in loose-leaf binders, using the Biflex 
Binder No. 21, manufactured for Messrs. Ginn & Co. This particular binder 
accommodates sheets 8 by 10 inches in size and has the following advantages 
over most of th& binders on the market: the sides and back are made of heavy 
board, the back reinforced by a metal strip so that crushing is impossible with 
ordinary use; the fastening for the individual sheets consists of two heavy spring 
wire loops which snap into two slots at the side and do not become loose or 
open when in use; the leaves lie perfectly flat when the binder is open and turn 
readily, without the hump along the back that is found in so many such devices; 
the pages can be inserted or removed at any place without disturbance of the 
remaining portion. 
For pages I use sheets of standard weight herbarium paper cut to size and 
punched with two holes, each page then accommodating three envelopes three 
inches wide and six or seven inches long. This size is ample for most specimens. 
The envelopes are made of stout bond paper (I use Old Hampshire Bond, No. 120) 
and are pinned directly to the sheets with ordinary, medium-sized pins. Care 
should be taken to secure a linen bond that is not brittle, otherwise the paper 
becomes fragile with age. Envelopes can in this arrangement be removed at 
any time for the insertion of new species, without upsetting the arrangement 
of the remainder of the collection, the old specimen being merely transferred to 
an extra leaf. The binders file in a bookcase like ordinary volumes, and the 
specimens are free from dust or possibility of loss. Actual experience shows 
that the envelopes do not tear loose, and that the portions of the pins projecting 
into the envelopes do not injure the specimens. Ordinarily, about fifty specimens 
can be put in each binder. 
HEPATIC EXCHANGE 
Will all who are interested in the exchange of Hepatics please consider the 
idea of an annual exchange in quantity, and, if interested, write to the undersigned. 
The last Hepatic Exchange List, published by Miss Haynes and Dr. Evans, 
will be used as a basis, and desiderata and oblata marked on it with the probable 
number of specimens of each species of the latter marked against the names. 
The undersigned will act as a distributor, and the lists, marked as indicated 
above, are to be sent to him about the end of October. The distributor 
will then inform each one of the number of oblata necessary, and these parcels 
are to be forwarded the distributor in December. Specimens will be distributed 
during January, as far as possible in proportion to the value of the oblata sent. 
If a sufficent number of replies are received to justify starting the Hepatic 
Exchange, further details will be published in the Bryologist. It is urgently 
requested that the reply to this notice be sent as early as possible. 
Address: Mr. A. H. Brinkman, Dowling Lake, Alberta, Canada. 
