This publisher’s series was published from 1894 to 1926. The books it contains are all reprints. The cover design changed every year two. Initially all the books came in labeled boxes.
By 1917 when this book was printed the Vademecum Series books were published with dust jackets.

Here is an example. Note that the interior of the jackets has a list of Altemus’ juvenile series books. Listed in the ads is Grace Harlowe’s Golden Summer which was published in 1917. Of note is that the dust jacket is made from brown uncoated paper. This is exceptional since as a general rule after 1915 all Altemus dust jackets have coated paper.