132 MISSOURI BOTANICAL GARDEN BULLETIN 
“3rd, The Arboretum, containing a collection of trees, compris- 
ing all that will grow in the open air in this climate and local- 
ity; a Pinetum for the Pine Family, a Quercetum for oaks and 
a Salicetum for willows.” 
The arboretum was started in 1860, and this part of the 
Garden received much personal attention from Mr. Shaw. 
The trees were mostly planted in rows, and many of them 
were measured each year to get the rate of wth. Un- 
fortunately, many of them were blown down y a tornado 
in 1896. 
Dr. Engelmann went to Europe again in 1868, and 
Mr. Shaw writes to him eagerly asking for more plants, seeds 
and specimens for the museum. In fact, Dr. Engelmann 
did more for the Garden and museum than anyone else, 
except Mr. Shaw himself. In 1868, the plants having out- 
grown the original plant houses, Mr. Shaw writes! that a 
palm house with additional wings for “moist store and 
temperate house” was built near the center of the Garden. 
Another letter, written January 24, 1869, tells of more 
changes: 
“Since I addressed you last, I have brought the plant houses 
to a finish, removing those that stood against the wall and put- 
ting them in range with the Palm House. The heating apparatus 
answers beyond my expectations... . The learned Agassiz was 
here last October and was much pleased with our garden. He 
promised some leaves and fruits of Amazonian palms for our 
Museum. The garden was visited by increased numbers the past 
Summer. I think not less than 40 to 50 thousand. I do wish we 
had something more interesting and instructive for the inspection 
of such multitudes,” 
Orchids now began to demand attention and the Gar- 
den collection was started by a gift from Mrs. Henry T. 
Blow of the orchids collected by her in Brazil. From that 
time on, orchids have been one of the favorite display plants 
in the Garden. ; 
In 1882, the plants having again outgrown their quar- 
ters, a larger house was built and “dedicated to Linnaeus by 
placing his bust over the entrance.’”2 This is the Linnean 
House and the only one of the plant houses built by Mr. 
Shaw that still remains. 
The Garden has always been open to visitors and for 
many years registers were kept, most of which are still in 
the possession of the Garden. The first one says on the 
title page: 
“Visitors to Tower Grove and the Botanical Garden are respect- 
fully requested to write their names. 
“Henry Shaw.” 
* Engelmann letters, vol. S, in Mo. Bot. Gard. 
* MSS. Guide to Missouri Botanical Gardens, by Henry Shaw. 
