Verkade albums
In the preface to the first album, readers were asked if they were interested in a sequel. However, any doubt regarding this proved unfounded. Verkade received letters not only from children but also from enthusiastic parents and teachers. Consequently, the volume Zomer (Summer) appeared a year later. In terms of design, the album was even more beautiful than Lente. It was designed entirely in the style of Art Nouveau and featured richly illustrated text pages. Improvements were made to each subsequent volume. For instance, for Herfst (Autumn), from 1908, the Latin names of plants and animals were also included in the index at the request of the reader. With the release of Winter in 1909, the series was complete.
The Dutch landscape takes center stage
Following the success of these albums, the Verkade firm wanted to release a series about the various Dutch landscape types in the Netherlands, maintaining the same quality. Between 1910 and 1913, four albums appeared, covering successively the dunes, the meadow, the Naardermeer, and forest and heath. The choice of the Naardermeer, instead of the planned subject of lakes and marshes, stems from Thijsse's fondness for this area. As a co-founder of the Association for the Preservation of Nature Monuments, he had managed to save the Naardermeer from becoming a garbage dump in 1906.
From flowers in the garden to animals in Artis
In the decades that followed, Verkade albums continued to appear (almost) annually, with nature as the main theme. Only during and after the First World War did the publication of albums come to a standstill for a few years. Thijsse continued to work regularly on albums, such as Texel, Paddestoelen (Mushrooms), and De Bloemen en haar vrienden (The Flowers and Her Friends). Over the years, other writers and artists were also involved, providing their own interpretation. As soon as a new album appeared, the public received it with great enthusiasm. Sometimes there were also unexpected side effects. For instance, the number of tourists on Texel increased due to the Texel album, many Dutch people acquired their own aquariums thanks to Mijn Aquarium (My Aquarium) by A.F.J. Portielje, and some biology teaching materials made grateful use of the illustrations. The popularity of the albums also prompted other companies to release their own collector's albums.