the note describes the materials probably while they were at the Society 
and not at the Farlow Herbarium. The materials described in the note 
have not been found in the Society’s archives, the Farlow Herbarium or 
the Peabody Museum (as suggested in an appended notation on the note). 
A small wooden box containing 46 vials bearing numbers and labels 
corresponding to entries in the i860 Catalogue was found in the Farlow 
Herbarium in 1976. It contained an unsigned note indicating 
These diatoms were collected by [Louis Franjois de] 
Pourtales and sent to Bailey (J.W.) to name. They 
were found in the Agassiz Museum [in] October, 1912 
and given to [the] Cryptogamic Herbarium [by Samuel 
Henshaw]. The numbers probably correspond to lists 
of J*W. Bailey in the Boston Soc. Nat. Hist. 
In the 1940’s David Linder produced a list of the contents of the vials 
based on data in the i860 Catalogue . I have made slides from the 
contents of each of these vials and given each the number of the vial 
prefixed by a "U", e^.jr. U231, on a round, 0.8 cm diameter, white label. 
Lastly, the general slide collection of the Boston Society of 
Natural History contained l6 slides specifically labelled indicating 
that they had been prepared from particular vials of unmounted material 
in the Bailey Collection. Each of these slides has been given the number 
of the vial from which it was prepared, again, prefixed with a "U" on 
the characteristic white label. All 64 slides prepared from unmounted 
material have been placed in Box #20. 
Many slides were made from Bailey’s unmounted material while it 
was possessed by the Society, especially before 1900, and undoubtedly 
these were dispersed and now are in different slide collections at the 
Farlow and other herbaria. Identification of these has not been undertaken 
now, but when it is done, it will be difficult and largely based on 
